Discussion
Unbalance in a rotor produces vibration principally at
Answer: D
Correct answer: once per revolution
An eccentric mass produces a rotating force vector fixed to the rotor, so a stationary sensor sees it once per revolution - at one times running speed. That signature is what distinguishes unbalance from misalignment, which appears predominantly at twice running speed, and it is why a vibration spectrum is diagnostic rather than merely a magnitude.
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